ANTI-LOCK BRAKE SYSTEM — SYMPTOM TROUBLESHOOTING
P-52flowchartHU = ABS hydraulic unit; CM = control module.
2 WARNING LIGHT REMAINS ON.
DETAILED DESCRIPTION: Warning light remains ON and ABS does not operate
Possible cause:
- If ABS warning light only illuminates, activate diagnostic mode and check for diagnostic trouble code.
- Malfunction of battery
- Malfunction of ABS warning light harness (fail-safe relay)
- Malfunction of ABS CM
2 — Warning light remains ON
1
STEP 1: With the SSTs (self diagnosis checker), verify that diagnostic trouble code is indicated. (Connect the SSTs to the data link connector) (Refer to page P-54)
Yes
Read diagnostic trouble code. Inspect as indicated (Refer to page P-56)
No
2
STEP 2: Is battery voltage OK? (Refer to page P-60)
No
Charge or replace battery
Yes
3
STEP 3: Are ABS warning light harness normal? (Refer to page P-60)
No
Inspect harness between ABS CM and ABS relay. Inspect harness between instrument panel and ABS CM. Inspect harness between instrument panel and ABS relay.
Yes
4
STEP 4: Connect terminal 2J of ABS CM connector (18 pins) to a ground and check the following points (IG ON): Operation sound of relay is heard. ABS warning light is not illuminated. 1D terminal of ABS CM connector indicates 12V.
No
5
Inspect ABS relay (fail-safe relay). Inspect harness between ABS relay (fail-safe relay) and ABS CM, battery. Inspect harness between ABS relay (fail-safe relay) and HU.
NOTE
CM: CONTROL MODULE